"A northern Syria there after northern Iraq... It is not possible for us to accept this," he said.

The loss of Kobane appeared to be a major blow for IS, which had seemed poised to seize the town after it began its advance on September 16.

It lost nearly 1,200 fighters in the battle, of a total of 1,800 killed, despite outgunning YPG forces with sophisticated weaponry captured from Iraqi and Syrian military bases.

Analysts said air strikes by the US-led coalition had been key to the YPG's success, taking out some of the jihadists' heavier weaponry and hitting their supply routes.

Forces from the Iraqi Kurdish peshmerga, as well as some Syrian Arab opposition forces, also reinforced the YPG in the fight.

IS emerged in Syria in 2013, and quickly captured large areas there and in neighbouring Iraq, imposing its harsh interpretation of Islamic law.

But analysts said the loss of Kobane could put the brakes on its plans for expansion.

"Despite all that manpower, all that sophisticated weaponry, IS couldn't get the city, so it's a big blow for their plans and it's a great achievement for the Kurds," said Kurdish affairs analyst Mutlu Civiroglu.